<p>A fire that killed 39 people at a Mexican detention center near the US border was started by migrants protesting against their expected deportation, President Andres Manuel Lopez Obrador said Tuesday.</p>.<p>"They put mats at the door of the shelter and set them on fire as a protest, and did not imagine that it would cause this terrible tragedy," he told reporters.</p>
<p>A fire that killed 39 people at a Mexican detention center near the US border was started by migrants protesting against their expected deportation, President Andres Manuel Lopez Obrador said Tuesday.</p>.<p>"They put mats at the door of the shelter and set them on fire as a protest, and did not imagine that it would cause this terrible tragedy," he told reporters.</p>